Gigabyte GA-M59SLI-S4 Manual - Page 27
PCIE_12V Power Connector, CPU_FAN / SYS_FAN / PWR_FAN Cooler Fan Power Connector
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English 3) PCIE_12V (Power Connector) The PCIE_12V power connector supplies extra power to the PCIE x16 slot. Connect this connector depending on your system requirements. PIin No. Definition 1 NC 1 2 GND 3 GND 4 +12V 4/5/6) CPU_FAN / SYS_FAN / PWR_FAN (Cooler Fan Power Connector) The cooler fan power connector supplies a +12V power voltage via a 3-pin/4-pin (only for CPU_FAN) power connector and possesses a foolproof connection design. Most coolers are designed with color-coded power connector wires. A red power connector wire indicates a positive connection and requires a +12V power voltage. The black connector wire is the ground wire (GND). Remember to connect the CPU/system fan cable to the CPU_FAN/SYS_FAN connector to prevent CPU damage or system hanging caused by overheating. 1 CPU_FAN 1 SYS_FAN/PWR_FAN Pin No. 1 2 3 4 Definition GND +12V Sense Speed Control (Only for CPU_FAN) - 27 - Hardware Installation